All of the following are chemical mutations EXCEPT
A. nitrogen mustard.
B. X-rays.
C. ethyl methanesulfonate.
D. hydroxylamine.
E. nitrous acid.
B. X-rays.
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With regard to RNA polymerase proofreading ability, which of the following is correct?
A) It is a very stringent activity, no tolerance for mistakes. B) It is similar to that of DNA polymerases. C) There are specialized mRNA repair pathways that fix errors. D) There is absolutely no proofreading that needs to be done. E) The 3' ? 5' exonuclease activity is sufficient
At approximately what size of predator population does the rate of prey population growth reach zero?
a. 20 b. 30 c. 40 d. 50
Cells that have a nucleus are referred to as ________ cells; those that lack a membrane-bound nucleus are called ________ cells
Fill in the blank(s) with correct word
Which of the following brain structures is active during REM sleep?
-the thalamus -the brain stem -the amygdala -all of the above